Two children are shipwrecked on a desert-island and fall in love while growing up together.

In the countryside of England, the Duc de Richleau a.k.a Nicholas welcomes his old friend Rex Van Ryn that has flown to meet him and Simon Aron, who is the son of an old friend of them that had passed away but charged them the task of watching the youngster. Nicholas and Rex unexpectedly visit Simon that is receiving twelve mysterious friends. Sooner Nicholas, who is proficient in black magic, learns that the guests are member of a satanic cult and Simon and his friend Tanith Carlisle will be baptized by the powerful leader Mocata to serve the devil. The two friends abduct Simon and Tanith expecting to save their souls but Mocata summons the Angel of Death and the Goat of Mendes to help him in a battle between the good and the forces of evil.

Sgt. Howie travels to Summerisle to investigate the disappearance of a young girl. He discovers that the locals are weird and unhelpful, and becomes determined to get to the bottom of the disappearance.